A Method of Estimating the Eigenstates of Density Operator  

作　　者：GAO Jingliang 

机构地区：[1]State Key Laboratory of Integrated Services Networks, Xidian University

出　　处：《Wuhan University Journal of Natural Sciences》2015年第5期386-390,共5页武汉大学学报（自然科学英文版）

基　　金：Supported by the National Natural Science Foundation of China(61271174,61372076,61301178)

摘　　要：We describe a mathematical structure which corresponds to the eigenstates of a density operator. For an unknown density operator, we propose an estimating procedure which uses successive ＂yes/no＂ measurements to scan the Bloch sphere and approximately yields the eigenstates. This result is based on the quantum method of types and implies a relationship between the typical subspace and the Young frame.We describe a mathematical structure which corresponds to the eigenstates of a density operator. For an unknown density operator, we propose an estimating procedure which uses successive ＂yes/no＂ measurements to scan the Bloch sphere and approximately yields the eigenstates. This result is based on the quantum method of types and implies a relationship between the typical subspace and the Young frame.

关 键 词：quantum state estimation EIGENSTATE density operator 

分 类 号：O431[机械工程—光学工程] TN911.7[理学—光学]